Transmission for vehicle

Abstract

A transmission for a vehicle includes a transmission shift unit that receives a shift command of the vehicle, a driving unit that generates a driving force for causing the transmission shift unit to be switched between positions, and a controller configured to control the driving unit for causing the transmission shift unit to be switched between the positions depending on whether a preset condition is satisfied. In particular, the driving unit includes a first stator to generate magnetic flux, a first rotor including first inner permanent magnets and second inner permanent magnets and configured to be rotated by the magnetic flux transmitted to the first inner permanent magnets, outer permanent magnets, a second rotor disposed between the second inner permanent magnets and the outer permanent magnets, and a clutch unit disposed between the first rotor and the second rotor.

What is claimed is: 
     
       1. A transmission for a vehicle, comprising:
 a transmission shift unit that receives a shift command of the vehicle; 
 a driving unit that generates a driving force for causing the transmission shift unit to be switched between positions; and 
 a controller configured to control the driving unit for causing the transmission shift unit to be switched between the positions depending on whether a preset condition is satisfied, 
 wherein the driving unit comprises:
 a first stator that generates magnetic flux, 
 a first rotor including first inner permanent magnets and second inner permanent magnets that are disposed circumferentially at regular intervals along a rotational axis, and configured to be rotated by the magnetic flux transmitted to the first inner permanent magnets, 
 outer permanent magnets that are provided in a different number than the second inner permanent magnets, 
 a second rotor disposed between the second inner permanent magnets and the outer permanent magnets, and 
 a clutch unit disposed between the first rotor and the second rotor. 
 
 
     
     
       2. The transmission of  claim 1 , wherein the clutch unit comprises:
 a base ring; 
 one or more rollers disposed between the base ring and the second rotor; and 
 one or more elastic parts provided on the base ring and configured to provide an elastic force to the rollers with respect to the base ring. 
 
     
     
       3. The transmission of  claim 2 , wherein the base ring includes seating surfaces configured to seat the rollers and to provide travel paths of the rollers,
 wherein each of the elastic parts is planar and elongated, and 
 wherein each of the seating surfaces is inclined corresponding to a longitudinal direction of each elastic part and a travel path of each roller. 
 
     
     
       4. The transmission of  claim 2 , wherein the base ring includes seating surfaces configured to seat the one or more rollers and to provide the rollers with travel paths, respectively, and
 wherein each of the one or more rollers is pushed by the second rotor when rotating, toward a spot where the seating surface and an inner surface of the second rotor are spaced by decreasing distances. 
 
     
     
       5. The transmission of  claim 4 , wherein the first rotor comprises:
 a rotating body and catch portions that protrude from the rotating body, 
 wherein the first rotor is rotated by a rotational force of the second rotor transmitted to the catch portions through the rollers. 
 
     
     
       6. The transmission of  claim 4 , wherein the first rotor comprises:
 a rotating body and catch portions that protrude from the rotating body, 
 wherein each of the one or more rollers is pushed by the catch portions when the first rotor rotates, toward a spot where the seating surface and the inner surface of the second rotor are spaced by increasing distances. 
 
     
     
       7. The transmission of  claim 5 , wherein the catch portions are disposed circumferentially, each being disposed between adjacent ones of the rollers. 
     
     
       8. The transmission of  claim 1 , wherein the first rotor is coupled to a rotor shaft formed elongated along a rotation axis, the rotor shaft being provided with a magnet holder that is configured to hold a magnetic substance. 
     
     
       9. The transmission of  claim 8 , further comprising:
 a magnetic sensor that detects a rotation angle of the first rotor by using a magnetic force distribution of the magnetic substance. 
 
     
     
       10. The transmission of  claim 1 , wherein the controller is configured to:
 control the driving unit to cause the shift unit to be switched to a parking stage position when a parking condition is satisfied; and 
 control the driving unit to cause the shift unit to be switched to a stowed position when a stowing condition is satisfied. 
 
     
     
       11. The transmission of  claim 10 , wherein the stowing condition comprises:
 at least one of turning off the vehicle or a user command input. 
 
     
     
       12. The transmission of  claim 1 , wherein the controller is configured to control, in response to the shift unit being switched from a first shift stage position to a second shift stage position when a shift condition is not satisfied, the driving unit to cause the shift unit to be switched to the first shift stage position. 
     
     
       13. The transmission of  claim 12 , wherein the controller is configured to output a warning alarm in response to the shift unit being switched from the first shift stage position to the second shift stage position when the shift condition is not satisfied. 
     
     
       14. The transmission of  claim 12 , wherein the controller is configured to determine whether the shift condition is satisfied by referring to at least one of an operation angle of a brake pedal or a driving speed of the vehicle. 
     
     
       15. The transmission of  claim 1 , wherein the second rotor is configured to be intermittently rotated in response to being subjected to a force greater than a magnetic force between the second inner permanent magnets and the outer permanent magnets.